Rebase to openresty 1.19.9.1

See commit messages for the details

.devcontainer/Dockerfile

+FROM storm2/ngx-voms-build
+
+USER root
+
+RUN yum install -y https://repo.ius.io/ius-release-el7.rpm centos-release-scl \
+    && yum install -y git224 devtoolset-10
+
+USER $BUILD_USER